400256093 has 2 divisors, whose sum is σ = 400256094. Its totient is φ = 400256092.

The previous prime is 400256029. The next prime is 400256099. The reversal of 400256093 is 390652004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 211935364 + 188320729 = 14558^2 + 13723^2 .

It is a cyclic number.

It is not a de Polignac number, because 400256093 - 2⁶ = 400256029 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400256099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200128046 + 200128047.

It is an arithmetic number, because the mean of its divisors is an integer number (200128047).

Almost surely, 2^400256093 is an apocalyptic number.

It is an amenable number.

400256093 is a deficient number, since it is larger than the sum of its proper divisors (1).

400256093 is an equidigital number, since it uses as much as digits as its factorization.

400256093 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 400256093 is about 20006.4013005838. The cubic root of 400256093 is about 736.9635086292.

The spelling of 400256093 in words is "four hundred million, two hundred fifty-six thousand, ninety-three".